S-91310A958 M20 x 100 mm ISO 4014, DIN 931 High-Strength Metric Class 10.9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior load-bearing capability with Class 10.9 strength rating and 150,000 psi tensile strength for reliable performance in high-stress environments
• Enhanced durability and wear resistance thanks to Rockwell C32 hardness, ensuring long service life in demanding industrial applications
• Secure and efficient installation with external hex drive and 30mm head width, allowing for high torque application and easy wrench access
• Optimized thread engagement through M20x2.5 coarse threading with Class 6g fit, providing excellent vibration resistance and assembly stability
• Versatile partial threading design with 46mm minimum thread length on 100mm shaft, offering flexibility for various clamping and fastening requirements
• Full regulatory compliance with ISO 4014/DIN 931 manufacturing standards, RoHS 3, and REACH regulations for safe global industrial use
• Right-hand thread orientation with metric system compatibility, ensuring straightforward installation and replacement in international applications

Professional Applications & Engineering Value

This M20 hex head screw delivers exceptional engineering value through its Class 10.9 steel construction and precision manufacturing. The combination of 150,000 psi tensile strength and Rockwell C32 hardness addresses critical industrial challenges including joint failure, vibration-induced loosening, and material fatigue in heavy machinery, structural steelwork, and equipment assembly. The partially threaded design with coarse metric threading provides optimal stress distribution while the external hex drive enables high-torque installation without stripping. Meeting ISO 4014/DIN 931 specifications, this steel fastener offers reliable performance in construction, manufacturing, and automotive applications where structural integrity and long-term reliability are paramount.

Specification Summary & Compliance

This metric hex bolt features precise Class 6g thread fit tolerance with M20x2.5 coarse thread spacing and partial threading extending 46mm minimum on the 100mm length. Manufactured to ISO 4014/DIN 931 standards for dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.